from buildings.’ Chris Davis, business development manager for renewables at heating company Dimplex says: ‘Heat pumps can be very flexible in terms of the types of buildings they can provide heating and cooling for, but it is crucial that they are designed correctly to fit the building.’ The higher you have to heat the water for the heating
system, the lower the COP of the heat pump. Davis offers the example of an underfloor heating system: ‘We see specifications come out from consultants who say they want to use a ground- or air-source heat pump and yet they specify the underfloor heating to work at
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50C, which is just crazy. Why not design the system to work at 40C? Then you get the best out of the heat pump. I think there is an education process to be gone through with some consultants.’
Specification Marshall says the biggest problem he faces is when heat pumps haven’t been sufficiently incorporated into the heating or cooling design specification for a project. How pumps should be controlled is also something that isn’t thought through by design consultants, he says.
Depiction of a CHP and ground-source heat pump system to supply underfloor heating and hot water
> August 2010 CIBSE Journal 41
Courtesy of ENER-G
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